I actually dicussed this with my professor recently.
It's suggested that it occurred 4 to 6 years BC... This is due to calendar changes & year length adjustments, among other factors. But there's really no way to determine it, or at least no credible way that I have seen.
Anyways, for most it's no more than an exercise in futility...as the only ones who truly appear to care are the hypocrites hiding behind the manipulative mask of Christianity. (I speak in generalites of course.) Every rule has an exception.
Well that's all for now.
later
c-lo